Or search: defer, douse, dowse, scrub, topic, cancel, lessen, loosen, remand, shelve, forgive, probate, respite, scratch, slacken
2 Syllables: SU
cricket, critic, cryptic, fitted, flitted, gibbet, hinted, Ibid, knitted, liquid, listed, livid, mitted, picket, picnic, pillaged, pitted, printed, quitted, rickets, rigid, signet, thicket, ticket, timid, twisted, vivid, witted
3 Syllables: USU
acquitted, addicted, afflicted, assisted, befitted, committed, conflicted, consisted, depicted, desisted, emitted, enlisted, envisaged, evicted, exhibit, imprinted, inflicted, insisted, omitted, permitted, persisted, predicted, resisted, restricted, Semitic, subsisted, transmitted, unfitted
4 Syllables: UUSU
analytic, catalytic, impolitic, paralytic, parasitic, unassisted, unrestricted
5 Syllables: UUUSU
apocalyptic, electrolytic
6 Syllables: UUUUSU
psychoanalytic

Found 66 words across 5 groupings. Skipped 6 excess words of a similar stem.